Finding the Fourth Proportional to 2,643.84, 3,961.65 and 999.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.84 : 3,961.65 = 999.50 : x
2. Step 2: Convert to fraction form
   2,643.84/3,961.65 = 999.50/x
3. Step 3: Cross multiply
   2,643.84x = 3,961.65 × 999.50
4. Step 4: Simplify right side
   2,643.84x = 3,959,649.37
5. Step 5: Solve for x
   x = 3,959,649.37/2,643.84
6. Step 6: Final answer
   x = 1,497.69